Locomotive crosshead



March 10, 1931. I s BURNHAM 1,795,759

LOCOMOTIVE CROS SHEAD Filed May 12, 1927 15 fully set forth.

' Patented Mar. 10, 1931 I uaireo HARRY s. BURNHAM, 0F smmm emey,ivEw'YoRK LoooMo'rIvE' deossiiete Application filed Mayra, 1527; s'ii'aiwere.

1% construction as will facilitate its mainte-,

nance in service, and effect a saving of time andlabor in taking upwear, when it becomes necessary or desirable todo so. I

The improvement claimed is hereinafter In the accompanying drawing:Figure 1 isa side View, in elevation, of the forward portion of a threecylinder locomotive embodying my invention, a portion being broken away,to illustrate more clearly the relation of the cross head to the middlecylinder; Fig. 2, a similar view, on an enlarged scale, of the crosshead and a portion of its guide; and Fig. 3,.a verticaltransversesection, on the line a a, of Fig. 2.

The cross head guides which are herein set forth are of the typegenerally applied in connection with the middle cylinder of a threecylinder locomotive, by reason of their presentation of a comparativelylarge area of bearing surface to oppose the upward thrust of the forwardend of the main connecting rod, and also because of the absence ofinterference between the front axle and a lower guide bar, which wouldexist with the application of a cross head.

of the alligator type. Prolonged service naturally results in wear ofthe sliding surface of the shoe of the cross head, and when the shoe isformed integrally with the body of the crosshead it is necessary,preliminarily, that the locomotive be spotted in such position as willenable the Wrist pin to be backed out, as it is accessible only betweenthe spokes of the'front driving wheels. Further, the cross head must bedisconnected from the piston rod, by driving out the tapped key by whichit is connected thereto. These operations require time, and it isdifficult to perform the work .in the narrow importantas that-Eoftliecrosshead the pistoiiirodsection. The shoe is detachably secured to rad,ety may 5.

coiifiiiesofthe spate which is available. n

Meteorites is obviously desirable to avoid, if poss ble, theseverance'ofa connection-as In'thepraetice eff invention, referring "desrifitivelyato the Spta'fie embodiment thereof which is hereineirernplified,thecross head, which is of the Dean type; comprises two detachablesectioas'; a body-,1; provided with bores; in vsfhich the wrist' pin; 2,is fit'ted iiiithe ordinary matter; and a shoeyle, comprising a tongue;interfitted between the spaced cheeks'llcl of the bodyportioii', and ahead having a top bearing face for engaging the bottom face of atopguide b2126 and extensions,

15, at each side, overlying-and bearing on lower latereuy spaced guidebars, 6a, or L the body, transverse bolts, 3, and nuts; 3a. The boltsteeth-rough; the-'eheeks'-oft1ie body aiid the toiigue' of thshoe. Thebody ofthe crasshead iscoaae t'edto the piston To pr'ovi-de forpreventing a cheeks, 1a,

or t eta-(1y 1-, othfiom'epretding and eldeing inythey' areea chprovided with theetension 10?, below the wrist pin 2,; fQi Ilifd withabor torthe assage of a bolt 1e, wh1ch so bolt carriesa spacing sleeve1f,-that' is inter posed between the cheeks, A nut 1g,o1'i thebolt'se'rve's' to hold the cheeks against spreading,'aiid the sleeve lf,serves to prevent their closing'iii; r t I 85 Thellower guide 6d,- aredetachably fastened tether-op guide jbar', by vertical bolts, 67), andnuts, C. p -It-wi1i be seen that the location of the bolts, 3, by whichthe" shoe'is connected to the body vofthecross head, is such that thereadily removable below the guide bars, and 'when it becomes necessaryto take up wear onthe sliding surfaces of the cross head, the shoe isremoved, relined, and replaced, or'a new shoe, having lined surfaces offull thicknes'syis applied without disturbance of economy of timeandlabor willbe obvious". l-

by, and depending below saidton gue and tongue and comprising spacedcheeks each having a wrist pin bore, an extension below the bore,detachable transverse means connecting the extensions and holding thesame from spreading and closing in, and means for connection to a pistonrod; and bolts passing through the walls of the pocket, and the tongue,det-achably connecting the body to the shoe. 1

' HARRY S. BURNHAM.

comprising spaced cheeks each formed with a wrist pin bore, extensionsbelow the wrist pin bore, and transverse detachable means connecting theextensions; and means for detachably fastening the body to the tongue.

2. Ina crossh-ead and guide for an intermediate piston of locomotiveshaving at least three cylinders in transverse series, the combination ofa guide comprising an upper rail, two transversely spaced lower rails,and means for detachably fastening the lower rails to the top rail,saidrails providing oppositely disposed grooves; aeshoe having a pair oflateral bearing members, each fitted in one of the grooves, and a pairof transversely spaced, longitudinal tongues depending between and belowthe lower rails; a body'entirely supported by the tongues and comprisinga pocket adapted to receive the tongues, means for connection toa'piston rod and means for connection to a driving rod; and boltspassing through thebody and the tongues, detachably connecting suchparts together.

3. In a crosshead and guide for an intermediate piston of locomotiveshaving at least three cylinders in transverse series, the combination ofa guide comprising an upper'rail, two transversely spaced lower rails,and means for detachably fastening the lower rails to the top rail, saidrails providing oppositely disposed grooves; a shoe having a pair oflateral bearing members, each fitted in one oi the grooves, and alongitudinal tongue depending between and below the lower rails; a bodyentirely supported by the tongue and comprising a pocket adapted toreceive the tongue, means for connection to the piston rod, and meansfor connection to a driving rod; and bolts passing through the body andthe tongue, detachably connecting such parts together.

In a crosshead and guide foran interediate piston of locomotives havingat least ee cylindersin transverse series, the'coination of a guidecomprising an upper ail,.two transversely spaced lower rails, and meansfor detachably fastening the lower rails to the top rail, said railsproviding oppositely disposed grooves; a shoe having a pair of lateralbearing members, each fitted in one of the grooves, and a longitudinaltongue depending between and below the lower rails; 21; body entirelysupported by the

